Apparatus for false twisting yarn



Feb. 20, 1962 E. FINDLOW 3,021,663

APPARATUS FOR FALSE TWISTING YARN Filed Nov. 4, 1957 2 Sheets-Shea? 1 INVENTOR Feb. 20, 1962 E. FlNDLOW 3,021,663

APPARATUS FOR FALSE TWISTING YARN Filed Nov. 4, 1957 2 Sheets-Sheet 2 |NVENTOR fiY R i TTORNEY States Unite This invention has reference to apparatus for false twisting yarn and has for its object to provide means, available for use in false twisting operations, whereby a very high speed of rotation of the yarn can be obtained which will result in a great increase in output of false twisted yarn.

According to this invention yarn to be false twisted is drawn from a package and-after false twisting is Wound on a further package, the false twisting being performed between the two packages by rotation of the yarn about its own axis by moving members engaging the outside of the same.

The invention is described with reference to the accompanying drawings, in which:

FIG. 1 is a front elevation of one form of mechanism for effecting the desired end;

FIG. 2 is a side elevation of the mechanism of FIG; 1; and

FIG. 3 is a plan of the mechanism of FIG. 1.

in carrying out the invention as shown in FIGS. 1, 2 and 3, there is mounted on an uptwister a pulley 6 which when in operation is pressed against the driving belt 7 of the uptwister. The pulley is conveniently mounted on a bracket carrying other parts of the apparatus and is movable to and from the belt, in a well known way not shown in the drawings.

Below the pulley 6, and compounded with it or so connected to the pulley that it is rotated with the pulley, is a gear wheel 8, or a friction wheel or a wheel from which a belt drive may be taken, which engages with two other wheels 9, 9 each on the top of a vertically mounted roller 19, so that the two rollers 10 are rotated by gearing or other means by the pulley 6.

These two vertical rollers 10 are mounted side by side and in front of the pulley 6, as well as below it, so that they are rotated in opposite directions at their points of adjacency, and they are conveniently mounted on a bracket or brackets 11. In front of each roller 16 and toward the front of the bracket is a further roller 12.

Each of the four rollers referred to is rotatably mounted on bearings in the bracket or brackets 11 or rotatably mounted on fixed pegs or pins on the bracket or brackets. It is preferable for each pair of rollers 10 and 12 to be mounted on separate brackets adjustable to and from each other as by a control screw 13.

As already described, each of the rollers 10 i.e. the two nearer to the pulley 6 is driven from the pulley, but each of the two front rollers 12 is freely rotatable and on each pair of back and front rollers 10 and 12 there are mounted endless driving belts 14, conveniently of rubber or any such like material. The belts may conveniently be of square section as shown, and they are spaced apart along the length of the rollers and alternated or staggered on the opposite pairs of back and front rollers so that they do not touch.

The pairs of back and front rollers it and 12 are so made and mounted that the respective endless belts 14 may overlap or be on one vertical line or they may be separated, means being provided to effect such an adjustment as already indicated. In one adjustment the outside faces of the belt on one pair of rollers may be in exact line with the outside faces of the other pair, and these belts will thus run parallel to one another in opatent O 3,021,663 Patented Feb. 20, 1962 posite directions between the back and front rollers 10 and 12. Above and below the system so far described are conveniently mounted guide eyes 15 to guide the yarn and hold it in engagement with the belts 14.

The yarn to be false twisted is drawn from a package (not shown in the drawings), is passed between the endless belts 14 and is taken up to a take-up. In this manner the yarn, which will be of small diameter and may be less than a hairs breadth in thickness, is nipped between the two sets of endless belts l4 and as these are moved by the rotation of the pulley 6, even if they move comparatively slowly, they will rotate the yarn at an enormous speed due to the gear ratio between their travel speed and the small diameter of the yarn.

For convenience of description it has been assumed that only one piece or end of yarn is false twisted, but it will be understood several pieces or ends may be false twisted at the same time as the length of the endless bands between the front and back rollers provides ample length for this to be done.

it will be seen that with the above described structure the yarn to be false twisted is guided along a path substantially parallel to the axes of the rollers 10 and i2 and located between these axes substantially at the location of the center of a rectangle in a plane normal to these axes and whose corners are located at these axes so that the yarn which is to be false twisted engages the free runs of the two sets of belts to be twisted thereby.

As a result of the overlapping or staggering of the two sets of belts, the yarn will bend first one way and then the other as it moves across the belts, in a manner similar to the curving of a yarn through the fingers of a gate tensioning device, so that with the invention it is possible to twist in an extremely efiicient manner yarns which have heretofore been difficult to twist, such as yarns having glossy exterior surfaces.

I claim:

1. Apparatus for imparting false twist to yarn traveling from a supply package to a take-up, comprising, in combination, a first pair of rolls having parallel axes and spaced from each other; a first set of spaced endless belts passing around and carried by said rolls so that when one of said first pair of rolls is rotated about its .axis the belts will all be driven; a second pair of rolls being parallel thereto; a second set of spaced endless belts passing around and carried by said second pair of rolls with the endless belts carried by said second pair of rolls located in alignment with the spaces between the belts carried by said first pair of rolls, said second pair of rolls being located close enough to said first pair of rolls such that the belts carried by said second pair of rolls extend into said spaces between the belts carried by said first pair of rolls, said first set of belts being aligned with spaces between said second set of belts; drive means cooperating with at least one roll of each pair of rolls for rotating all of said rolls in the same direction; and guide means for guiding yarn to be twisted along apath substantially parallel to the axes of said rolls and located between said axes substantially at the location of the center of a reotangle in a plane normal to said axes of said rolls whose corners are located at said axes so that the yarn which is twisted engages the free runs of the two sets of belts to be twisted thereby.

2. Apparatus for imparting false twist to yarn traveling from a supply package to a take-up, comprising, in combination, means for guiding the yarn to be twisted along a yarn path located substantially in a predetermined plane; at least a pair of endless belts; means mounting said pair of endless belts for movement in longitudinal direction thereof and with straight, yarn-engaging belt portions thereof extending with their outer faces substantially in said predetermined plane spaced from each other and substantially normal to said yarn path so as to be adapted to engage with said outer faces said yarn while the same passes along said yarn path; at least a third endless belt; means mounting said third endless belt for movement in longitudinal direction thereof and with a straight, yarn-engaging belt portion thereof extending with its outer face directed oppositely to the yarn engaging faces of said pair of endless belts; substantially in said predetermined plane between said outer faces of said straight yarn-engaging belt portions of said pair of endless belts and substantially normal to said yarn path so as to be adapted to engage said yarn while the same passm along said yarn path, the distance between a plane which includes said outer faces of said yarn-engaging belt portions of said pair of belts and a plane which includes said outer face of said yarnengaging belt portion of said third belt being less than the thickness of the yarn; and means for moving said pair of endless belts in one direction and said third endless belt in an opposite direction normal to said yarn path, whereby said oppositely moving belts will engage and twist the yarn.

3. Apparatus for imparting false twist to yarn traveling from a supply package to a take-up comprising, in combination, yarn guiding means for guiding along a given path yarn which is to be twisted; first belt means having a straight, flexible operating run located adjacent and extending across said path, said first belt means having at least one yam-engaging portion having at said operating run a yarn-engaging face engaging only one side of said yarn so as to leave the opposite side thereof unsupported; second belt means having a straight, flexible operating run located spaced from said operating run of said first belt means and extending across said path parallel to said operating run of said first belt means, said second belt means having at least one yarn-engaging portion having at said operating run of said second belt means a yarn-engaging face directed oppositely to the yarn-engaging face of said yarn-engaging portion of said first belt means and engaging only said opposite side of said yarn so as to leave said one side thereof unsupported, both of said yarn-engaging faces of said first and second belt means being respectively located from the path along which the yarn is guided by a distance less than the thickness of the yarn so that said faces directly engage the yarn at longitudinally spaced portions thereof; and drive means co-operating with said first and second belt means for moving said operating runs thereof respectively in opposite directions.

4-. Apparatus for imparting false twist to yarn traveling from a supply package to a take-up comprising, in combination, first endless belt means having opposite end portions respectively extending around a first pair of parallel axes and having between said end portions a pair of flexible straight runs respectively located on opposite sides of a first plane including said axes, said first belt means having at least two axially spaced endless yarn-engaging portions defining an endless gap between themselves; second endless belt means located beside said first belt means, having opposite end portions respectively extending around a second pair of axes parallel to said first pair of axes, and having between its end portions a pair of flexible straight runs respectively located on opposite sides of a second plane including said second pair of axes, said second belt means having at least one endless yarn-engaging portion aligned with said gap, said pair of yarn-engaging portions of said first belt means respectively having at the run of said first belt means which is located between said planes outer side faces located in a third plane and said yarnengaging portion of said second belt means having at the run thereof located bet-ween said first and second planes an outer side face located in a fourth plane adjacent and being substantially parallel to said third plane the distance between said third and fourth planes being less than the thickness of the yarn; drive means cooperating with both of said belt means for moving the runs thereof between said first and second planes respectively in opposite directions; and yarn-guiding means for guiding yarn in a direction parallel to said axes along a path extending across said runs of both belt means with all of said yarnengaging portions engaging the yarn to twist the same during operation of said drive means.

References Qited in the file of this patent UNITED STATES PATENTS 113,831 Archibald Apr. 18, 1871 1,630,179 Hilden June 18, 1912 2,262,589 Peck Nov. 11, 1941 2,522,332 Abbott Sept. 12, 1950 2,590,374 Brown Mar. 25, 1952 2,863,280 Ubbelohde Dec. 9, 1958 FOREIGN PATENTS 164,599 Australia Aug. 15, 1955 

